<template>
    <el-menu :default-active="activeMenu" mode="horizontal" @select="handleSelect" :ellipsis="false">
        <template v-for="(item, index) in topMenus">
            <el-menu-item :style="{ '--theme': theme }" :index="item.path" :key="index" v-if="index < visibleNumber">
                <svg-icon :icon-class="item.meta.icon" />
                {{ item.meta.title }}
            </el-menu-item>
        </template>

        <!-- 顶部菜单超出数量折叠 -->
        <el-sub-menu :style="{ '--theme': theme }" index="more" v-if="topMenus.length > visibleNumber">
            <template #title>更多菜单</template>
            <template v-for="(item, index) in topMenus">
                <el-menu-item :index="item.path" :key="index" v-if="index >= visibleNumber">
                    <svg-icon :icon-class="item.meta.icon" />
                    {{ item.meta.title }}
                </el-menu-item>
            </template>
        </el-sub-menu>
    </el-menu>
</template>

<script setup>
import { constantRoutes } from '@/router'
import { isHttp } from '@/utils/validate'
import useAppStore from '@/store/modules/app'
import useSettingsStore from '@/store/modules/settings'
import usePermissionStore from '@/store/modules/permission'

// 顶部栏初始数
const visibleNumber = ref(null)
// 当前激活菜单的 index
const currentIndex = ref(null)
// 隐藏侧边栏路由
const hideList = ['/index', '/user/profile']

const appStore = useAppStore()
const settingsStore = useSettingsStore()
const permissionStore = usePermissionStore()
const route = useRoute()
const router = useRouter()

// 主题颜色
const theme = computed(() => settingsStore.theme)
// 所有的路由信息
const routers = computed(() => permissionStore.topbarRouters)

// 顶部显示菜单
const topMenus = computed(() => {
    let topMenus = []
    routers.value.map((menu) => {
        if (menu.hidden !== true) {
            // 兼容顶部栏一级菜单内部跳转
            if (menu.path === '/') {
                topMenus.push(menu.children[0])
            } else {
                topMenus.push(menu)
            }
        }
    })
    return topMenus
})

// 设置子路由
const childrenMenus = computed(() => {
    let childrenMenus = []
    routers.value.map((router) => {
        for (let item in router.children) {
            if (router.children[item].parentPath === undefined) {
                if (router.path === '/') {
                    router.children[item].path = '/' + router.children[item].path
                } else {
                    if (!isHttp(router.children[item].path)) {
                        router.children[item].path = router.path + '/' + router.children[item].path
                    }
                }
                router.children[item].parentPath = router.path
            }
            childrenMenus.push(router.children[item])
        }
    })
    return constantRoutes.concat(childrenMenus)
})

// 默认激活的菜单
const activeMenu = computed(() => {
    const path = route.path
    let activePath = path
    if (path !== undefined && path.lastIndexOf('/') > 0 && hideList.indexOf(path) === -1) {
        const tmpPath = path.substring(1, path.length)
        activePath = '/' + tmpPath.substring(0, tmpPath.indexOf('/'))
        if (!route.meta.link) {
            appStore.toggleSideBarHide(false)
        }
    } else if (!route.children) {
        activePath = path
        appStore.toggleSideBarHide(true)
    }
    activeRoutes(activePath)
    return activePath
})

function setVisibleNumber() {
    const width = document.body.getBoundingClientRect().width / 3
    visibleNumber.value = parseInt(width / 85)
}

function handleSelect(key, keyPath) {
    currentIndex.value = key
    const route = routers.value.find((item) => item.path === key)
    if (isHttp(key)) {
        // http(s):// 路径新窗口打开
        window.open(key, '_blank')
    } else if (!route || !route.children) {
        // 没有子路由路径内部打开
        const routeMenu = childrenMenus.value.find((item) => item.path === key)
        if (routeMenu && routeMenu.query) {
            let query = JSON.parse(routeMenu.query)
            router.push({ path: key, query: query })
        } else {
            router.push({ path: key })
        }
        appStore.toggleSideBarHide(true)
    } else {
        // 显示左侧联动菜单
        activeRoutes(key)
        appStore.toggleSideBarHide(false)
    }
}

function activeRoutes(key) {
    let routes = []
    if (childrenMenus.value && childrenMenus.value.length > 0) {
        childrenMenus.value.map((item) => {
            if (key == item.parentPath || (key == 'index' && '' == item.path)) {
                routes.push(item)
            }
        })
    }
    if (routes.length > 0) {
        permissionStore.setSidebarRouters(routes)
    } else {
        appStore.toggleSideBarHide(true)
    }
    return routes
}

onMounted(() => {
    window.addEventListener('resize', setVisibleNumber)
})
onBeforeUnmount(() => {
    window.removeEventListener('resize', setVisibleNumber)
})

onMounted(() => {
    setVisibleNumber()
})
</script>

<style lang="scss">
.topmenu-container.el-menu--horizontal>.el-menu-item {
    float: left;
    height: 50px !important;
    line-height: 50px !important;
    color: #999093 !important;
    padding: 0 15px !important;
    margin: 0 10px !important;
}

.topmenu-container.el-menu--horizontal>.el-menu-item.is-active,
.el-menu--horizontal>.el-sub-menu.is-active .el-submenu__title {
    border-bottom: 2px solid #{'var(--theme)'} !important;
    color: #303133;
}

/* sub-menu item */
.topmenu-container.el-menu--horizontal>.el-sub-menu .el-sub-menu__title {
    float: left;
    height: 50px !important;
    line-height: 50px !important;
    color: #999093 !important;
    padding: 0 5px !important;
    margin: 0 10px !important;
}
</style>
